by 
The Curious Bag
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<h4 class="dechead">On One Hand: Mildew Is Not Toxic
Mildew is a type of fungus that grows in moist place like showers and toilets. It is very similar to but not exactly the same as mold, which is a fungus that tends to grow on decaying surfaces. You can identify mildew by its gray or white color and its somewhat fuzzy appearance. Some types of mold are in fact toxic and dangerous, but mildew is not toxic.
On the Other: Mildew Should Be Removed
Mildew is a sign of stagnation in a wet area and a clear indicator that cleaning is needed. Left uncleaned, an area that has mildew may begin to develop mold, which can have more serious health repercussions.
Bottom Line
Generally speaking, mold is cited as being a more serious health concern than mildew. Some types of mold are toxic and the EPA lists mold as agent that can trigger asthma. Mildew is likely to appear before mold in a porcelain basin like a toilet, and in the healthy practice of keeping home free of mold and mildew, should be cleaned away as soon as it appears.
Source:
Black Mold Removal Guide: The Difference Between Mold and Mildew
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